Griuding-mill



H9, D. 'GRAN-GER;

GrindngfMill.'

Patented March 9, 1858.

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unirsi) sTA'rEs PATENT oFF-ion.

R. D. GRANGER, OF PHILADELPHIA, PENNSYLVANIA.4

GRINDINGr-MILL.

Specification of Letters Patent No. 19,559, dated March 9, 18%58.

To all whom t may concern:

Be it known that I, RENSSELEAR D. GRAN- GER, of the city of Philadelphiaand State of Pennsylvania, have invented certain new and usefulImprovements Mills; and I do hereby declare the following to be a full,clear, and eXact description of the sama-reference being had to theaccompanying drawing and to the letters of reference marked thereon.

My invention relates to improvements in mills having a number of annulargrinding cones, and my improvements consist in a mode of admitting thegrain or other material to t-he separate grinding surfaces, whereby theproper amount; may be distributed to each, and in a novel arrangement ofgearing fully described hereafter, by the` adoption of which, the millmay be driven either, by the ordinary lever, to which a horse is hitchedor by a belt.

In order to enable others skilled inthe art to make and use myinvention, I will now proceed to describe its construction andoperation.

On reference to the accompanying drawing, which forms a part of thisspecification; Figure 1 is a sectional view of my improved grindingmill. Fig. 2 a ground plan of the same.

A is the boX for receiving the ground materials. To the top of this boxis secured the annular shell B, the upper portion a of which forms thehopperl for receiving the materials to be ground. The lower portion isdivided by the intermediate piece b into two annular, angular recesses,both sides of each recess -having cutting and grinding teeth similar tothose of ordinary mills. The upper portion of the shell or hopper isdivided from the lower or grinding portion, by the intermediate piece o'and a partition on each side of the same, through which are a series ofopenings c c for the passage of the material to be ground.

Adapted to the outer angular, grinding recess of the shell is theannular bur C, and to the inner recess of the shell, the inner annularbur D, both burs being secured byY bolts d Z to the cross bar E, and thelatter being secured to the vertical spindle F, the upper end of whichturns in the central hub of the bridgetree G. The latter has four arms,three of them (lettered h) being secured to the hopper by means of boltsj, which are attached to the intermediate piece in Grinding- Z2. Thefourth arm i projects horizontally and terminates in a hub, in whichturns the upper end of the driving shaft H, the lower end turning in aprojection 7c, which is attached to or forms a part of the shell B. Theshaft F is furnished atthe top with a bolt m, which passes through awasher n on the central hub of the bridgetree. the end of the bolt'beingfurnished with nuts,'by turning which in one direction or the other thegrinding surfaces of the burs may be brought nearer to or removedfarther vfrom those of the shell. A pinion I. on the shaft F gears intolthe wheel J on the driving shaft H, the cogs of the pinion being broaderthan those of the wheel, in order that both may remain in gear when theshaft and the burs are raised or lowered b v the nuts of the bolt m.

It will be observed, that the intermediate piece b is carried upwardinto .the hopper, so 'as to provide the latter into two smaller hoppers,one for the outer and the other for the inner grinding portion of themill. It should be understood that the teeth in the upper grindingsurface of the shell and burs are coarser than those in the lowerportion of the same, and that the general disposition of the teeth isvaried according t-o the nature of the material to be operated upon.

The burs being set in motion, by turning the shaft H, the grain or othersubstance will drop through the orifices c o, and, being acted upon bythe grinding surfaces of the shell and burs, will be reduced to therequired consistency, and be dropped into the boX A. As the outer burmoves over more space, in the same time, than the inner bur, and hasconsequently more duty to perform, the orifices c c of the former mustbe larger or more frequent thang those of the latter; and as each set oforifices has its own hopper, there is no fear of the grain crowding moreinto one set of orifices than the other.

In grinding mills of a large size, in which other than manual power isrequired, great difficulty has been found in readily adapting them to bedriven at pleasure by either a belt or the ordinary lever, to which ahorse is hitched. This change cannot be affected without a great loss of time, and without removing and adding complicated machinery.

By the peculiar arrangement of the gear wheels I and J, and theirsituation as regards the bridgetree, I am enabled to effect this changein a moment; for should horseshaft.

power be required to drive the mill, one end of a lever is attached tothe top of the driving shaft H and a horse hitched to the other end, inwhich case, the horse will move in a track eccentric with the shell andburs, instead of concentric with them as in other mills. Should it bedesirable to drive the mill by means of a belt, the lever is removed anda pulley attached to the top of the The use of a large driving wheel,gearing into a smaller one on the bur, as applied to mills to be drivenby horsepower, presents the further advantage over the ordinary mills,in which the lever is attached directly to the bur, of allowing the useof a much increased length of lever, without diminishing the speed ofthe bur, and consequently allowing a much greater diameter of track forthe horse to traverse, the advantage of which is well known.

Without laying any exclusive claim to the employment of two moregrinding cones, and without confining myself to any par- 4wheel J, wheneach is arranged in relation to the other, substantially as herein setforth and for the purpose specified.

In testimony whereof, I have signed my name to this specification beforetwo subscribing witnesses.

RENSSELEAR D. GRANGER.

Witnesses HENRY HowsoN, HENRY ODIORNE.

